A memo written by Apple's late co-founder Steve Jobs, dating back to his time at Atari, generated $27,500 when it went under the hammer at the same event, exceeding its estimated value of $15,000 (£9,500).

The Apple 1 was hand-built by Jobs's fellow co-founder Steve Wozniak and sold for $666.66 (£426) as a fully assembled circuit board. Only around 200 of the devices were ever created, 50 of which are thought to still be in circulation.

The machine that was sold during the Sotheby's auction, won by a persistent telephone bidder, came with its original instruction manuals.

Jobs's memo was written in 1974 when the tech mastermind was 19 years old. It is a four-page document containing suggestions about how to improve Atari's World Cup football game.